I did have a Commodore 116/16 in the 80’s as a boy, but I haven’t known the 10 PRINT program until recently. I used to draw the pattern on a graph paper, though, when I was bored at school. Later, I implemented a program in Perl that tries to change the maze to eliminate its unreachable parts by connecting them to the existing path. You can view the code at PerlMonks [http://www.perlmonks.org/?node_id=843144] and watch a screencast at Youtube [https://www.youtube.com/watch?v=HqyeksHSoRo].